Let Sims wear their assigned CAS outfits instead of weird situational ones, please

I wonder why they made Sims change outfits for the festivals in the first place. And now they also look like that in nightclubs… ugh. Why not let them wear their everyday outfits at a festival and their party ones when visiting a nightclub (they never did before for some reason). Is this really so hard? Don't mind the Geek Con cosplays, though, as long as Darth Vader doesn't wear pink pumps or something.